\documentclass{article}

\usepackage{array}
\newcolumntype{C}[1]{>{\centering\let\newline\\\arraybackslash\hspace{0pt}}m{#1}}
\renewcommand{\arraystretch}{2.0}

\begin{document}

\begin{tabular}{|>{\bfseries}C{5cm}|C{1cm}|C{1cm}|C{1cm}|C{1cm}|C{1cm}|C{1cm}|}
    \hline
    Bandwidth (MHz) & 1.25 & 2.5 & 5.0 & 10.0 & 15.0 & 20.0 \\
    \hline
    Subcarrier bandwidth (kHz) & \multicolumn{6}{c|}{15} \\
    \hline
    Physical resource block (PRB) bandwidth (kHz) & \multicolumn{6}{c|}{180} \\
    \hline
    Number of available PRBs & 6 & 12 & 25 & 50 & 75 & 100 \\
    \hline
\end{tabular}

\end{document}
